1/*
2 * Copyright (c) 2012, 2013 SAP SE. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include <stdio.h>
26#include <sys/ldr.h>
27#include <errno.h>
28
29#include "porting_aix.h"
30
31static unsigned char dladdr_buffer[0x4000];
32
33static void fill_dll_info(void) {
34  int rc = loadquery(L_GETINFO,dladdr_buffer, sizeof(dladdr_buffer));
35  if (rc == -1) {
36    fprintf(stderr, "loadquery failed (%d %s)", errno, strerror(errno));
37    fflush(stderr);
38  }
39}
40
41static int dladdr_dont_reload(void* addr, Dl_info* info) {
42  const struct ld_info* p = (struct ld_info*) dladdr_buffer;
43  info->dli_fbase = 0; info->dli_fname = 0;
44  info->dli_sname = 0; info->dli_saddr = 0;
45  for (;;) {
46    if (addr >= p->ldinfo_textorg &&
47        addr < (((char*)p->ldinfo_textorg) + p->ldinfo_textsize)) {
48      info->dli_fname = p->ldinfo_filename;
49      info->dli_fbase = p->ldinfo_textorg;
50      return 1; /* [sic] */
51    }
52    if (!p->ldinfo_next) {
53      break;
54    }
55    p = (struct ld_info*)(((char*)p) + p->ldinfo_next);
56  }
57  return 0; /* [sic] */
58}
59
60#ifdef __cplusplus
61extern "C"
62#endif
63int dladdr(void *addr, Dl_info *info) {
64  static int loaded = 0;
65  if (!loaded) {
66    fill_dll_info();
67    loaded = 1;
68  }
69  if (!addr) {
70    return 0;  /* [sic] */
71  }
72  /* Address could be AIX function descriptor? */
73  void* const addr0 = *( (void**) addr );
74  int rc = dladdr_dont_reload(addr, info);
75  if (rc == 0) {
76    rc = dladdr_dont_reload(addr0, info);
77    if (rc == 0) { /* [sic] */
78      fill_dll_info(); /* refill, maybe loadquery info is outdated */
79      rc = dladdr_dont_reload(addr, info);
80      if (rc == 0) {
81        rc = dladdr_dont_reload(addr0, info);
82      }
83    }
84  }
85  return rc;
86}
87